s3-rpc_server: Created an Endpoint Mapper Daemon.

Signed-off-by: Günther Deschner <gd@samba.org>

1 files changed, 279 insertions, 0 deletions

diff --git a/source3/rpc_server/epmd.c b/source3/rpc_server/epmd.c
new file mode 100644
index 0000000000..7bc1ebca89
--- /dev/null
+++ b/source3/rpc_server/epmd.c
@@ -0,0 +1,279 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *
+ *  SMBD RPC service callbacks
+ *
+ *  Copyright (c) 2011      Andreas Schneider <asn@samba.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+
+#include "serverid.h"
+#include "../librpc/gen_ndr/messaging.h"
+#include "../librpc/gen_ndr/srv_epmapper.h"
+#include "rpc_server/rpc_server.h"
+
+#define DAEMON_NAME "epmd"
+
+void start_epmd(struct tevent_context *ev_ctx,
+		struct messaging_context *msg_ctx);
+
+static bool epmd_open_sockets(struct tevent_context *ev_ctx,
+			      struct messaging_context *msg_ctx)
+{
+	uint32_t num_ifs = iface_count();
+	uint16_t port;
+	uint32_t i;
+
+	if (lp_interfaces() && lp_bind_interfaces_only()) {
+		/*
+		 * We have been given an interfaces line, and been told to only
+		 * bind to those interfaces. Create a socket per interface and
+		 * bind to only these.
+		 */
+
+		/* Now open a listen socket for each of the interfaces. */
+		for(i = 0; i < num_ifs; i++) {
+			const struct sockaddr_storage *ifss =
+					iface_n_sockaddr_storage(i);
+
+			port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
+							       msg_ctx,
+							       ndr_table_epmapper.syntax_id,
+							       ifss,
+							       135);
+			if (port == 0) {
+				return false;
+			}
+		}
+	} else {
+		const char *sock_addr = lp_socket_address();
+		const char *sock_ptr;
+		char *sock_tok;
+
+		for (sock_ptr = sock_addr;
+		     next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,");
+		    ) {
+			struct sockaddr_storage ss;
+
+			/* open an incoming socket */
+			if (!interpret_string_addr(&ss,
+						   sock_tok,
+						   AI_NUMERICHOST|AI_PASSIVE)) {
+				continue;
+			}
+
+			port = setup_dcerpc_ncacn_tcpip_socket(ev_ctx,
+							       msg_ctx,
+							       ndr_table_epmapper.syntax_id,
+							       &ss,
+							       135);
+			if (port == 0) {
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+static void epmd_reopen_logs(void)
+{
+	char *lfile = lp_logfile();
+	int rc;
+
+	if (lfile == NULL || lfile[0] == '\0') {
+		rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
+		if (rc > 0) {
+			lp_set_logfile(lfile);
+			SAFE_FREE(lfile);
+		}
+	} else {
+		if (strstr(lfile, DAEMON_NAME) == NULL) {
+			rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
+			if (rc > 0) {
+				lp_set_logfile(lfile);
+				SAFE_FREE(lfile);
+			}
+		}
+	}
+
+	reopen_logs();
+}
+
+static void epmd_smb_conf_updated(struct messaging_context *msg,
+				  void *private_data,
+				  uint32_t msg_type,
+				  struct server_id server_id,
+				  DATA_BLOB *data)
+{
+	struct tevent_context *ev_ctx =
+		talloc_get_type_abort(private_data, struct tevent_context);
+
+	DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
+	change_to_root_user();
+	epmd_reopen_logs();
+}
+
+static void epmd_sig_term_handler(struct tevent_context *ev,
+				  struct tevent_signal *se,
+				  int signum,
+				  int count,
+				  void *siginfo,
+				  void *private_data)
+{
+	exit_server_cleanly("termination signal");
+}
+
+static void epmd_setup_sig_term_handler(struct tevent_context *ev_ctx)
+{
+	struct tevent_signal *se;
+
+	se = tevent_add_signal(ev_ctx,
+			       ev_ctx,
+			       SIGTERM, 0,
+			       epmd_sig_term_handler,
+			       NULL);
+	if (se == NULL) {
+		exit_server("failed to setup SIGTERM handler");
+	}
+}
+
+static void epmd_sig_hup_handler(struct tevent_context *ev,
+				    struct tevent_signal *se,
+				    int signum,
+				    int count,
+				    void *siginfo,
+				    void *private_data)
+{
+	struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
+								  struct messaging_context);
+
+	change_to_root_user();
+
+	DEBUG(1,("Reloading printers after SIGHUP\n"));
+	epmd_reopen_logs();
+}
+
+static void epmd_setup_sig_hup_handler(struct tevent_context *ev_ctx,
+				       struct messaging_context *msg_ctx)
+{
+	struct tevent_signal *se;
+
+	se = tevent_add_signal(ev_ctx,
+			       ev_ctx,
+			       SIGHUP, 0,
+			       epmd_sig_hup_handler,
+			       msg_ctx);
+	if (se == NULL) {
+		exit_server("failed to setup SIGHUP handler");
+	}
+}
+
+void start_epmd(struct tevent_context *ev_ctx,
+		struct messaging_context *msg_ctx)
+{
+	NTSTATUS status;
+	pid_t pid;
+	bool ok;
+	int rc;
+
+	DEBUG(1, ("Forking Endpoint Mapper Daemon\n"));
+
+	pid = sys_fork();
+
+	if (pid == -1) {
+		DEBUG(0, ("Failed to fork Endpoint Mapper [%s], aborting ...\n",
+			  strerror(errno)));
+		exit(1);
+	}
+
+	if (pid) {
+		/* parent */
+		return;
+	}
+
+	/* child */
+	close_low_fds(false);
+
+	status = reinit_after_fork(msg_ctx,
+				   ev_ctx,
+				   procid_self(),
+				   true);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0,("reinit_after_fork() failed\n"));
+		smb_panic("reinit_after_fork() failed");
+	}
+
+	epmd_reopen_logs();
+
+	epmd_setup_sig_term_handler(ev_ctx);
+	epmd_setup_sig_hup_handler(ev_ctx, msg_ctx);
+
+	ok = serverid_register(procid_self(),
+			       FLAG_MSG_GENERAL|FLAG_MSG_SMBD
+			       |FLAG_MSG_PRINT_GENERAL);
+	if (!ok) {
+		DEBUG(0, ("Failed to register serverid in epmd!\n"));
+		exit(1);
+	}
+
+	messaging_register(msg_ctx,
+			   ev_ctx,
+			   MSG_SMB_CONF_UPDATED,
+			   epmd_smb_conf_updated);
+
+	status = rpc_epmapper_init(NULL);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("Failed to register epmd rpc inteface! (%s)\n",
+			  nt_errstr(status)));
+		exit(1);
+	}
+
+	ok = setup_dcerpc_ncalrpc_socket(ev_ctx,
+					 msg_ctx,
+					 ndr_table_epmapper.syntax_id,
+					 "EPMAPPER");
+	if (!ok) {
+		DEBUG(0, ("Failed to open epmd ncalrpc pipe!\n"));
+		exit(1);
+	}
+
+	ok = epmd_open_sockets(ev_ctx, msg_ctx);
+	if (!ok) {
+		DEBUG(0, ("Failed to open epmd tcpip sockets!\n"));
+		exit(1);
+	}
+
+	ok = setup_named_pipe_socket("epmapper", ev_ctx);
+	if (!ok) {
+		DEBUG(0, ("Failed to open epmd named pipe!\n"));
+		exit(1);
+	}
+
+	DEBUG(1, ("Endpoint Mapper Daemon Started (%d)\n", getpid()));
+
+	/* loop forever */
+	rc = tevent_loop_wait(ev_ctx);
+
+	/* should not be reached */
+	DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
+		 rc, (rc == 0) ? "out of events" : strerror(errno)));
+
+	exit(1);
+}
+
+/* vim: set ts=8 sw=8 noet cindent ft=c.doxygen: */